Intention tremor
Intention Tremor[edit | edit source]
Intention tremor is a neurological disorder characterized by a rhythmic, oscillatory movement of a body part during goal-directed tasks. Unlike tremors that occur at rest, intention tremors become noticeable when an individual actively engages in a task, such as reaching for an object.
Definition[edit | edit source]
An intention tremor is a form of dyskinetic disorder that exhibits a broad, coarse, and typically low-frequency (below 5 Hz) tremor. This type of tremor becomes evident during deliberate, visually-guided movements, and its amplitude increases as the affected body part approaches its target.
Characteristics[edit | edit source]
- Direction: The tremor usually occurs perpendicular to the direction of the intended movement.
- Dysmetria: A common accompanying symptom, dysmetria is where an individual overshoots or undershoots their intended target due to the tremor.
- Frequency: It typically presents at a frequency below 5 Hz.
Causes and Anatomy[edit | edit source]
The primary anatomical region associated with intention tremor is the cerebellum. Specifically:
- Dysfunction in the lateral zone of the cerebellum, which is responsible for controlling visually guided movements, is often the root cause.
- Depending on the precise location and extent of cerebellar damage, intention tremors can manifest either unilaterally (on one side of the body) or bilaterally (on both sides).
- The side of the cerebellum exhibiting dysfunction typically corresponds to the same side of the body displaying the tremor.
Differential Diagnosis[edit | edit source]
When assessing an intention tremor, it's crucial to differentiate it from other forms of tremors, such as:
- Resting tremor: Occurs when the body part is at rest and not performing any task.
- Postural tremor: Manifests when holding a position against gravity.
- Kinetic tremor: Occurs during any voluntary movement.
Treatment[edit | edit source]
While there's no cure for intention tremor, several interventions might help manage its symptoms:
- Medications: Certain drugs, including anticonvulsants and beta-blockers, may provide relief.
- Physical and Occupational Therapy: Therapists can offer strategies and exercises to enhance coordination and reduce the impact of tremors on daily activities.
- Deep Brain Stimulation (DBS): In severe cases, DBS, a surgical procedure, might be considered.
See Also[edit | edit source]
References[edit | edit source]
- "Intention Tremor: Clinical Implications and Pathophysiology." Journal of Neurology and Neurosurgical Psychiatry.
- "Dysmetria and Intention Tremor: A Clinical Guide." Neurological Reviews.
- "Deep Brain Stimulation for Treatment of Tremors." Clinical Neurosurgery.
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